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.Dd March 13, 2011
.Dt THDAT 1
.Os GensokyOS
.Sh NAME
.Nm thdat
.Nd Touhou archive tool
.Sh SYNOPSIS
.Nm
.Ar command Ns Op Ar version
.Op Ar archive Op Ar
.Sh DESCRIPTION
The
.Nm
utility extracts files from an archive or creates a new archive from a set of files.
The following commands are available:
.Bl -tag -width Ds
.It Ar c Ns Oo Ar version Oc Ar archive Ar file Op Ar
Archives the specified files.
.It Ar l Ns Oo Ar version Oc Ar archive
Lists the contents of the archive.
.It Ar x Ns Oo Ar version Oc Ar archive Op Ar
Extracts files.
If no files are specified, all files are extracted.
The format is not automatically detected.
.It Ar V
Displays the program version.
.El
.Pp
The version specifies which archive format to use.
Running the program without a command will list the supported formats.
The greatest version number is used by default.
.Sh ENVIRONMENT
.Bl -tag -width OMP_NUM_THREADS
.It Ev OMP_NUM_THREADS
The number of threads to be used for compression and decompression.
The default used when
.Ev OMP_NUM_THREADS
is not set depends on the OpenMP implementation.
.El
.Sh EXIT STATUS
The
.Nm
utility exits with 0 on success, 1 on error.
.Sh EXAMPLES
Create a new archive from the input files:
.Bd -literal -offset indent
thdat c6 output.dat input.anm input.msg input.ecl
.Ed
.Pp
Lists the contents of the specified archive:
.Bd -literal -offset indent
thdat l128 th128.dat
.Ed
.Pp
Extract all files from the archive to the current working directory:
.Bd -literal -offset indent
thdat x8 th08.dat
.Ed
.Sh SEE ALSO
.Lk http://code.google.com/p/thtk "Project homepage"
.Sh CAVEATS
BGM archives are not supported by the
.Nm
utility.
.Sh BUGS
The format used by TH03-TH05 uses separate encryption keys for each entry in the archives, as well as one key for the entry list.
It is not known if these keys are computed from the entries, or if they are randomly assigned.
They are currently set to constant values.
.Pp
Original TH08 and TH09 archives contain a large amount of encrypted zero padding at the end of the entry list.
This padding is reduced to four bytes.
.Sh SECURITY CONSIDERATIONS
File names may not be properly sanitized when extracting.
Furthermode, invalid data may not be properly handled.
Do not extract untrusted archives.
